What is the definition of "shard"?

The term "shard" refers specifically to a broken piece or fragment of a material object, commonly used in contexts involving glass, ceramics, or other brittle substances. It conveys the idea of something that has been shattered or broken, resulting in sharp fragments that may vary in size. This aligns perfectly with the definition, as it captures the essence of what a shard is—essentially a part that is no longer whole.

The other choices do not capture the meaning of "shard." A fleeting thought suggests something transient and immaterial rather than a physical fragment. A conceptual idea is abstract and does not relate to tangible broken pieces. Lastly, a complete object indicates something whole and intact, which is the opposite of what a shard represents. Understanding that "shard" has a specific and physical connotation is essential in distinguishing it from more abstract concepts.